I think this is a bug with FileTapHandler class because this happens only when the rename is started while one file is check-selected.

I can see the problem ;-)   (google.com/search?q=engineer+guillotine)

This bug was introduced from crosreview.com/622332.

Now I have to work out how to fix this bug but not regress the other 2 bugs:  crbug.com/755774 ,  crbug.com/756839 

yamaguchi@ and fukino@, please let me know if you have any ideas for this.

I'd recommend you to begin with reading FileTapHandler class, which is the class that I added when we introduced touch-specific UI.
My guess is, when it is in the check-select mode (at least 1 or more file has the checkbox checked), tapHandler_.hadleTouchEvents goes to the "touch to toggle select" block. It doesn't distinguish whether the tap is inside the rename text box or not.
(This is another issue caused by it; tapping causes toggle file selection.)
So my suggestion is not to do the touch-specific action in the tapHandler_.handleToucheEvents, but just let it processed by the emulated mouse click, while renaming is in progress. Some other functions uses namingController_.isRenamingInProgress() for seeing such condition.

I guess it would also resolve the issue with virtual keyboard.
In FileListSelectionController.prototype.handleTouchEvents, if tapHandler_.handleTouchEvents just refuses (=return false), then it won't hit the path introduced by change 622332.

Also, the problem should also be verified in the grid view (thubmnails) mode.

> (This is another issue caused by it; tapping causes toggle file selection.)
To clarify, this means:
""" Besides the issue that Touching renaming text field closes soft keyboard, touching the renaming text field also toggles the selection of the file, which is also considered a bug. """

<files-triage>

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/db634e6c248307e59c623c3633dfc4422b1ce9f2

commit db634e6c248307e59c623c3633dfc4422b1ce9f2
Author: Joel Hockey <joelhockey@chromium.org>
Date: Fri Feb 16 02:55:08 2018

Revert to click handling for touch on input during rename

Bug:  762667 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iebf2bf6bc2adf62e723013602f92f3451aed8038
Reviewed-on: https://chromium-review.googlesource.com/920203
Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537152}
[modify] https://crrev.com/db634e6c248307e59c623c3633dfc4422b1ce9f2/ui/file_manager/file_manager/foreground/js/ui/file_table_list.js

Google Chrome	66.0.3352.0 (Official Build) dev (64-bit)
Platform	10431.0.0 (Official Build) dev-channel eve
Firmware Version	Google_Eve.9584.107.0